Table 4 Validation at 12Â months using the test and external validation datasets
From: Predicting COPD 1-year mortality using prognostic predictors routinely measured in primary care
| Â | Mean | SE | 95% CI | Mean | SE | 95% CI |
|---|---|---|---|---|---|---|
| Â | Test set | External validation | ||||
Harrell’s C-index | 0.794 | 0.006 | 0.782–0.807 | 0.671 | 0.012 | 0.647–0.695 |
D-statistic | 1.865 | 0.048 | 1.770–1.959 | 0.983 | 0.080 | 0.826–1.141 |
Calibration slope | 0.947 | 0.024 | 0.900–0.993 | 0.544 | 0.046 | 0.454–0.635 |